Multiple-fuse device



April 16, 1929. F. w. BAUM 1,708,963

MULTIPLE FUSE DEVICE Filed Feb. 8, 1925 8 Sheets-Sheet 2 avweutoz FRED IKE/20M 351 A1: alum/m1,

April 16, 1929. F. w. BAUM 1,708,963

MULTIPLE FUSE DEVICE Filed Feb. 8, 1923 8 Sheets-Sheet 3 vwemtoz April 16, 1929. F. w. BAUM MULTIPLE FUSE DEVICE Filed Feb. 8, 1923 8 Sheets-Sheet 6 Mum l-r- April 16, 1929. I F, w, BAUM 1,708,963

MULTIPLE FUSE DEVICE Filed Feb. 8. 1925 a Sheets-Sheet v 132 MFC' My 122 1m 2; 138i 154 L-L:/156 16g 1 E g If Qwwemtoz m-D WBHUM.

April 16, 1929. v F. w. BAUM 1,708,963

MULTIPLE FUSE DEVICE Filed Feb. 8, 1925 8 Sheets-Sheet 8 INVENTOR fled 1K Baa/m BY M ATTORNEY Patented Apr; 15, 1929,

FRED W. BAUM, 6F HER/VAR Application filed February s, 1923.

This invention vices.

In commercial lighting and power installations the wiring, fuses and switches are covered by conduits and metal boxes for the purpose of fire protection and toprevent the thert of current before it has passed through the meter. 'l he metal boxes contain the switches and fuses and in some types of boxes the meter is connected to the box. Such boxes when ii tailed are sealed or locked to prevent tampering therewith and to prevent access thereto by unauthorized persons. Should a fuse blow out it cannot be replaced until an authorized person opens the box, unless the seal or lock is broken by an un authorized person. 7 To replace a fuse is moreover dangerous. Such boxes while serving as a protection and while completely enclosed, are obviously a great inconvenience 111 cases when a fuse blows out.

nts have been made to remedy such hence by providing boxes in which s can be removed and replaced by the part of the box containing the fuses without opening or exposing the part of the box containing the switch, it being necessary to open the switch before the fuse can be removed. Such a device is illustrated so in the liries Patent l lo. 1,224,880 patented May 1, 1917. In such devices the power can be easily stolen by anyone who knows how.

Nor does the fact that the switch is open prevent dangerous shocks as in some types of boxes, the switeh merely controls the load and not the power. y

By my invention all of the advantages of described construct-ions are re ed while providirg means for convenchanging; iuses should one blow out.

"i he 1 resent invention utilizes fuses of. standard shape such as the enclosed cartridge or p types. Such fuses comprises fusible elem. he or wire of fu l le metal which is enclosed in an insulating c2 the latter sometimes being packed with insulating ma terial such as asbestos powder. The cartridge type fuse has at opposite ends metal caps or constituting the terminals of the car fridge and adapted to be inserted 1n clips.

IIE'W' ASSIGNOE, BY lfl IvII-ETROEOLITAN DEVICE CQRPORJ'LTIGN, OF BRQQKLYII,

relates to multiple fuse dc connect Parser osri'es.

AEFSEGNMENTEL T0 EEK YORK, A CUB/P03 EE'ULT'EP'LE-FUSE DEVICE.

The plug fuse which is called herein an enclosed fuse, 1S adapted to fit in a socket, the base or threaded shell of the fuse forming one terminal and the other terminal extend ing axially throughthe base. The fuse employed maybe single enclosed fuses'of the abovetypes or preferably I employ multiple fuse devices of the enclosed cartridge 01 plug types, that is, an enclosed fuse liming sevsible the standard fuse boxes in use, that is,

the invention is characterized by simplicity of construction and arrangement of parts and by the ease and convenience of manipulation and of replacement of fuses, when necessary,

and at the same time providing a safe, practical and efficient device which meets the requirements of underwriters and power companies and wh'ch will not cause the consumer annoying delays 'vhen a fuse blows out. I

An object of the invention is to provide a practical, simple, and efficient fuse her: which is inaccessible term-authorized persons, yet allowing the changing of fuses should one blowout.

Another object of the invent-ion is to provide a fuse box in which fuses may be'easily inserted and removed when the box is open and providing'means operable externally of the box to change fuses should one blow out, while maintaining the box closed and inaccess e to unauthorized persons.

Another object of the invention is to provide an externally operable fuse arrangement for a fuse and switch box which can be operated only when the switch is open.

Another object of the invention is to provide an attachment for cartridge fuse boxes to adapt the box for plug fuses embodying the invention.

Another object ofthe invention is to provid a single actuating means for controlling a plurality of multiple fuses in a manner to 2), ace, 1

any fuse of the other device, determined by the number of actuations.

Another object of the invention is to provide an improved enclosed fuse of the multiple type adapted for use in fuse boxes or for general use.

In the accompanying drawings I have illustrated several embodiments of the invention in which:

Fig. 1 is a plan View of one embodiment illustrating the use of fuses of the multiple plug type, the casing being broken away.

Fig. 2 is a sectional view on the line 22 of Fig. 1 looking in the direction of the arrows.

Figs. 3, 4 and 5 are detail views, on an enlarged scale, of a plug fuse which may be used in the embodiment of Figs. 1 and 2.

Fig. 6 is a plan View illustrating how a cartridge fuse type of installation may be chan ed into a plug fuse type, enabling the use of the invention as embodied in Figs. 1 and 2, a portion of the casing being broken away.

Fig. 7 is a sectional view thereof on the line 77 of Fig. 6 looking in the direction of the arrows.

Fig. 8 is a plan View illustrating another form of the invention, a part of the casing being broken away.

Fig. 9 is a sectional view thereof on the line 99 of Fig. 8, looking in the direction of the arrows.

Fig. 10 is asectional detail of a locking means, on an enlarged scale and on the line 10-1O of Fig. 8 looking in the direction of the arrows.

Fig. 11 is a sectional view of another embodiment of the invention, parts being omitted. I

Fig. 12 isan elevation of the device illustrated in Fie. 11.

Fig. 13 is an elevation, with parts in section and parts omitted, of another embodiment of the invention.

Fig. 14c is a sectional view thereof on the line 14-14l of Fi 18, looking in the direction of the arrows.

Fig. 15 is an elevation, with the casing in section, of another form of the invention.

Fig. 16 is a detail elevation thereof, on an enlarged scale, with parts omitted and parts in section.

Fig. 17 is an end view and. Fig. 18 is a side View on an enlarged scale of an enclosed multiple fuse cartridge adapted for use in the forms of the invention illustrated in Figs. 15 and 16 and in Figs. 21 and 22.

Figs. 19 and 20 are similar views of an enclosed multiple fuse cartridge adapted for general use.

Fig. 21 is a plan view, with parts omitted, illustrating how a plurality of multiple fuses may be actuated by a single lever or actuating means and Fig 22 is an elevation thereof, with the casing in section.

Fig. 23 is an elevation, partly in showing another modification.

F ig. 24- is a detailed sectional. View thereof with the parts in sepa ated position.

Fig. 25 is a detailed bottom plan of the actuating mechanism shown at Fig. 23.

Fig. 26 is a plan View of the socket, parts being broken away.

Fig. 27 is an elevation showing another modification, and

Fig. 28 is a plan thereof.

In F igs. 1 and 2 is illustrated a metal fuse and switch be): 1 having a cover 2 hinged at one end 3 and adapted to be locked at the opposite end by means of a lock or seal 4. Mounted within the box on the bottom is a base 5 of insulating material. lliiounted upon the base 5 is a blade switch 6 having two blades, (one of which is shown) for controlling the lines and :tuated from the exterior of the boX by means of a lever journalcd in the sides of the b 2:, ci'innected to the switch 6 and insulated therefrom. The power conduit and power wires (not illustrated) enter the box at an; desired point through knockouts (not illustrated) the wires bein electrically connected to terminals 8. The conduit and wires to the local circuits (not illustrated) likewise enter the box, the wires bein elo ctrical y connected to the terminals 9.

inserted in circuit between the terminals 8 and the blades of switch 6 are the threaded sockets 10 adapted to receive the fuses 11. The fuses 11 are of the enclosed multiple plus type which can be easily inserted into and removed from the soc acts 10 and which complete the circu ts in the box through the tcrininals and switch.

In 3, way of example the dot. fuses, known as a sis: in o .c. fuse comprises a porcelain member or 1,)

section,

having secured to it and enclosing metal shell or thb le 13 to .red

threads 14. whereby the ruse iuav be in its socket 10. The upper end oi the no. -c

lain piece is flanged at 15, the a =i. i being secured to a reduced portion neuiber 12. A member 16 carries the ser ral fuse jular 21:

1'5 and terminate in rigid terminals 21 in the holes-s 20. A metal conducting rod. 22 secured eone end to plate 18 extends axially throi member 16 and through an axial hole 22 through the porcelain piece 12. A. spring is interposed between a head on rod and the porcelain piece 12 within the hole 1 scribed in detail in United States mos '22 to draw the parts 12 and 16together and to cause the head 24 to project beyond the lower end of the piece 12 and contact with a corresponding fuse receiving terminal. in the socket 10 when inserted therein. The ring 13 forms the other terminal of the fuse wl'iic'h cooperates with the socket terminal and may be electrically connected to any of the fuse terminals '21 in the following manner. A metal pin 25 is slidably mounted in the porcelain piece 12 in a position such that upon rotation of member 16 relatively to member 12 the pin 25 can be positioned in any of the several holes 20 in contact with any terminal 21. The lower end-of pin is connected to the ring 13 by a flexible conductor 26. The porcelain piece 12 is cut away as indicated at 27 to allow free movement of the pin 25 and of the conductor 26. Tnterposed between the piece 12 and a metal head 28 on )in 25 is a spring 29 to allow the relative rotation of the parts 12 and 16 over each other to a new fuse wire position and to insure that the head 28 will be forced into contact with a terminal 21 when the parts are properly alinedL When it is desired to change from one fuse wire 19 to another the member 16 is raised against the tension of the spring 23 sufficiently to withdrew pin 25 from its hole 20 and is then rotated until the pin 25 enters another hole 20 and engages a new terminal 21. To further insure correct operation the member 16 is provided with six vertical grooveson slots 30 upon vertical surfaces of the recess 17 while the flange 15 is provided with vertical ridges 31 adapted to mesh with the slots30 and thus properly aline the pin 25. When the member 16 is raised, the grooves and ridges disengage and when member 16 is rotated the ridges 31 ride over the portions 32 of member16 until they aline with a different set of grooves when the spring 23 forces them into place. lVhen the member 16 is lifted the central terminal rod 22' is lifted out of engagementwith the central socket contact and remains out of engagement until a new fuse wire is connected. Allof the electrical connections and wires should be properly protected and insulated. line obviors multiple plug fuse may contain any n or convenient number of fuse wires. plug fuse above describer forms per so e part of the invention and shown and do- ,ees

means which prevent them from being pulled out while the cover is closed. All exposed parts of the fuses 11 are preferably covered with metal caps 37 of which the flanges 36 preferably form parts.

The fuses 11 are screwed into their sockets 10 and then the cover 2 is closed around them and locked or otherwise secured against entry by unauthorized persons. The flanges prevent t 1e several multiple fuses from being unscrewed from their sockets and pulled out. Should a fuse wire 19 of either fuse blow out a new fuse wire 19 can be placed in position by lifting;- either member 16 and rotating it as above described. This can be done without opening the box and without waiting for someone to come to put in a new fuse. When the fuse wires of any multiple set are about exhausted the cover can be raised and a new fuse plug; can be substituted for the old one. Such fuse plugs ofthe enclosed multiple type can be available in quantities and can be placed. in their sockets as is the present practice but only when the cover is up. Before rotating any member 16 to place a new fuse wire in position the switch 6 may be opened.

lVhile the invention is shown applied to a two wire system it is equally applicable to a three wire system. The invention is applicable to bottom fuse switches in which the switch 6 is interposed between the source of powerancl the fuses but is especially of adin top fuse switches in which the it cs interposed between the swiJCh a" th source of power, (as illustrated in Figs.

and 2} in the latter case the switch control l'ng the load. In all cases. by the use of the present invention, shocks are prevented in the replacement of fuses irrespective of the position of the switch and whether it is open or not. This is not true of switch boxes now in use.

Then also it should be noticed that in the embodiment illustrated inl igs. 1 to 5 the central. pin 22 is disconnected from its socket terminal when shifting; to a new fuse wire position.

A feature of the COBSi'UCtlOll above cleseribed is that the cover 2 can be opened without removing" any of the parts of the fuse devices 1 and when'the cov is in place the fuse devices are complete so as to be readily operated externally by anyone in case a fuse blows out. The fuse wires of each multiple fuse are completely enclosed and protected and the fuse deviceis readily removable and replaceable when necessary but not until the cover is opened. The invention is simple, Hate. easily operated and affording complete protection to the power coinpanie.

theft of current. It can he applied to existing types of boxes Without revolutiorary changes in their construction or arrangement of parts.

In Figs. 6 ant. 7 l have illustrated how the invention can be applied to certain construe-- tioni' now in use. The box. 40 has .ezl cover ll which is locked or secured. when iii Within the be): mounted an insulat- Q lurving; pa clips 48 enclosed e tch 4.4 tor clips being fl1ll{,TH-.. -liS type meter not illustrated) which opening (not shown} in wall d is connected up in a Well ml ment (ZOEDPLlSQS a ting: material on socltets 4'? haw & strip in elec- Eli.

' 1p or piece .8 c which are mounted pl trical n to each sncltet ad bridging; condu' (one of \vl 'ch is shown.) which may be secured to he clips 43 t each line brid in; e

ineinec e soeke plug; fuses 11 or .escribed, these Fuses ester. 1 ines in the cover All e- The invei io 6 t n col neetion with Figs. 1 to 1 he forexisting; cartridge t changed to the Dill if L 3y ion illustrated in F may no i. rennet-tel The switch and fuse 303. cr 53 -qwq .1 ningcc at o the covei Vent access to the box or nauthorized persons. The ho illus 1S or the type to which a meter may be connected at the c: 55 through an opening thereul (not lllusrated). Upon the orcclaui base 56 within the hon are he switch terminals 57 and fuse connecting t nmnals 58 and a pivoted switch 59 coniprir blades (one being shown mos,

mounted upon the base 56 upon opposite sides outside of the switch blades, one set being shown. One terminal 58 of each set is electrically connected to a pair 01" spaced clips adapted to receive an end of an enclosed cartridge fuse CF and the other terminal 58 is electrically connected t an angular metal braclqetfio for pivotally supporting a multiple use device (57 oi the present invention.

The multiple "fuse device 6? comprises a metal head (l8 having a plurality of sockets 69 and pivoted at 70 to cars on the outer end of the hrac t 66. Ci11'(3(l vv 'thin the els 39, prcilerahl v by means of set screws Tl. are the ends of several cartridge fuses CF, the opposite ends of the Y CF being positioned to successively enter between and dissocis engage the clips to complete the fuse cir cult. An insulating handle '72 is secured to each head (38 and extends at the opposite side 01? pivot '70 through a slot 73 in the cover whereby either handle 72 may he swung in their slots to place any of the uses Cl? into clips the ends 7% of the slots acting stops and being so located that either outer fuse of each heao is in the clips, when handle is at one end of the slot 73 or other.

the th A coil snan spring 75 is secured at one end '4 to the han Lie '1' on side of pivot 70 vii gage- CF and clips (35.

' ion the l; BCiG is positioned as shown the co tral fuse is in clips 65 and spring T5 inactive.

To prevent to the bot-i and to close the slots $3 I provide irctal shields 75$ nounted below the sl )i"; tor movement with the h i dies 72 and pre e ably slid: :,hl

.-,d in guises 79 ecured to the bottom oi? or. the snehs T8 havin holes 80 wueh the h: idles p: l fhile A" i ."J

-.cre iln the ope ds do not i: r

.1 they prevent access J. i or is closed and in oin operation o1 externallv.

in some cases it is preferal le that means he provided to lock ti .o s ave al multiple use devices 67 noveinent or change until the switch In the embodiment illustrated in Figs. 8. 9 and 10 I have simwn a loci-ring means which may he used. lhis locking means comprises for each multiple fuse device a pair of pins 81 sl'idahl -r mounted in hearings in each insulating plate 60 the switch 59 and adapted to engage opposite sides of any cartrid 'fuse CF which is in the fuse clips 65. The inner ends'of the pins are provided with conical heads 82. interposed between the heads 82'and the hearings are coil springs 83 tending normally to withdraw the opposite ends of*the pins away from the opposite sides of the clipped fuse. Steps 8% are provided upon the pins at the opposite sides of their bearing to prevent the springs 83 from forcing the pins out of their bearings.

Mounted upon the porcelain base 56 between the switch blades is a stationary cam having inclined surfaces 86 adapted to (:0- act with the conical heads 82 of the pins 81. The operation of the device or locking means is as follows: When the switch 59 is opened the pins 81 are raised wit-h it, the inclined surface 86 allowing the heads 82 to move inwardly as the pins are raised and until finally the heads disengage the cam. The pins 81 then disengage the fuses, the springs 83 forcing them back out of the way. When a new fuse is properly clipped in by handle 72, the switch 59 is closed and the conical heads 82 engage the cam 85 and the pins 81 are forced inwardly to lock the multiple fuse devices against actuation or movement. The locking device may be omitted if not required or if desirable.

The form of the.invent-ion illustrated in Figs. 8 and 9, like the form illustrated in 1 and 2, allows the replacement of a blown out fuse without opening the box. The fuse illustrated is of an enclosed standard type. By actuating the handles 72 one way or the other any of the fuses of each multiple fuse installation within the box may be moved into clipped position and may be maintained in clipped position by means of the spring clips 65, assisted by spring 75'when the handle is against either stop 74. Each multiple fuse head 68 is adapted for three fuses. Any desired or convenientnumber of fuses may be employed however and the device is operative until all the fuses of either installation have blown out. It will then be necessary to open the box. Lhis can be done by an authorized person, such as an employee of thepower company. To open the box all that is necessary is to lift the cover. The handles being of such a character to allow this without first removing any parts. To replace any of the fuses within the box the handle 72 is, after the box is opened, tilted back so that it lies against the outer angular portion 87 of the fuse conducting bracket 66. The snap spring 75 tends to hold the handle in that position with the fuse head 68 and its fuses so located as to be away from the terminals 58 and clips 65 and as to be convenient for replacing cartridge fuses without danger of shocks.

In Figs. 11 and 12 is illustrated another form of the invention. This form like the one just described involves the use of enclosed cartridge fuses but ofa special design in which the cartridges are arranged in tandem or in alignment and can be moved axially ries between the successive terminals 8990.

The device 88 is mounted in a closed fuse box 91, for example, of the character illustrated in Figs. 1 and 2 or 8 and 9, one such device being inserted in each line. The box 91 also contains a switch (not shownlfor controlling either the load or the power. For each fuse device 88 there is provided in the box 91 spaced clip terminals 92 adapted to engage and electrically connect the several sections of the fuse device 88, engaging the terminals 89 and 90 thereof. The terminals 92 are mounted centrally within a tube 93 preferably of insulating material and in this tube 93 through removable plug 9 is placed the multiple fuse 88. Between an end of the fuse 88 and the end 9d of the tube 93 is a coil spring 95- tending normally to force the tandem fuse 88 to the opposite end of the tube. Engaging the opposite end of the tandem fuse is an insulating plunger 96 having a handle 97 projecting through and ridable in a slot 98 in the tube 98 and extending through a step like slot 99 in the side of the fuse box 91 Fig. 12, the handle terminates in a ring 100 outside of the box whereby it may be actuated. The slot 99 comprises vertical portions 101 connected by inclined portions 102. The vertical portions hold the handle 97 locked against movement due to spring 95 and are so located as to hold the successive sections 88' in the clips 92. Should the left- I hand fuse section Fig. 11) blow out, by pulling the handle 97 to the left through the inclined slot 102 and allowing it to snap into the middle vertical portion 1.01, fuse 88 is moved back against the tension of spring 95 and the second tandem fuse section 88 is placed in the clips 92, the handle having suflicient resiliency to allow it to ride up the incline and then to snap down into place locking the fuse 88 in position against movement due to the spring 95. The number of steps in the step like slot 99 will vary with the number of sec tions 88' in the tandem fuse.

To lock the handle 97 in each position, to close the slot 99 against access to the box therethrough by unauthorized persons and to completely enclose the box when in use, there is provided a combined lock and shield 103 which also prevents ,the changing of the fuses until the switch within the box is first opened. For this purpose to the switch control handle 104 which is of the usual construction such as illustrated in Fig. 1, is secured the plate or shield 103 which is arranged to extend down over the slot when the switch is closed and to be moved upwardly out of the way when the switch is open. The lower edge of shield 103, which is secured to the :uvitch handle i side the casing, is provided with a plurality of notcncs arranged to alinc with the v' *tical portions 101 oil the slot 99 and to straddle the ha lie 07 at any of its locking points in the side 01' the casing or box.

lVith the construction disclosed the handle can not be actuated unti. the switch is first pened, unlocking it and allowing its movementin the slot 00, the slot being con'iplctely closed at all times when the switch is closed.

The combined locking means and shield may be omitted, it not required or if des' "ed.

The multiple luse arrangement illustrated in Fig. 11 is of the enclosed type making it against fire and is of a type which may he easily replaced when all the fuses are used up. The i use sections 88 instead of being secured togeth r may be placed in alignment as cartridges are placed in a magazine and in such case the standard enclosed type of cartridge fuse may be employed.

In Figs. 13 and 1% is illustrated another form of the invention utilizing an enclosed fuse oi? the single iuse type above described, which is standard and may be purchased in the open market. The multiple "fuse devices 106 illustrated each comprises a rotatable support 107 mounted and secured to a shaft 108 journaled at its inner end in a bearing 109 within the box 110 and at its outer end 111 in a bearing in the side of the casing or box 110 handles 112 being provided on the outside of the casing 110 for rotating the shafts 108. lilounted upon the insulating or porcelain block 113 in the box are pairs of tuse receiving terminals or spaced fuse clips 11%. The rotatable supports 107 are provided with openings or holes 115 in each of which may he secured transversely there an enclosed fuse, CF having the usual metal terminals 51. These "fuses are secured transversely of the rotatable mountings 107 within the holes 115 by any suithle means such as the set screws 116 onw ing the centers of the fuses. The supports 10? are so mounted relative to the clips 114. that upon their rotation the cartridge fuses Cl. mounted thereon may be successively moved into clipped positions with their metal heads secured in and in Contact with e ch part of spring clips 114%. The clips are arranged relatively to the rotatable s ports 10? to allow a cartridge C1 when rotated to enter at one side of the clips and to more out ot engagement therewith at the opposite side. It is to be understood that the arrangement of the two sets of multiple devices may be changed. For instance they may be arranged with their axes parallel to each other mosses nstead of in alignment. The multiple carridge devices illustrated in Figs. 13 and 1 )rovide means whereby fuses may be changed oi the box while maintann r ya.

s an uuprovenieut upon the construction oil llnued States Patents Nos. 1,254,400 and 1208,80: 111 which the details of construction are shown and described, comprises a tubular casing 11'? of insulating material in which are enclosed a plurality of fusible wires 118 (in the "form illustrated, four in number) all elect it-ally connected at one end to a ii: .zd metal cap 119 and terminati at their opposite ends in i3 spaced pin like terminals 120 listed in openin 121 in the opposite end of the fuse body. A metal cap 122 is rotatably and axially movably mounted on this end of the fuse, constituting the opposite exposed terminal of the cartridge. Any oi the tuse wires 118 may be electrically connected to the cap by means of a springy tubular terminal coin nector 123 secured to cap 122 and adapted to telescope around eaca pinlike terminal 120, formin a good contact and electrical connection therewith 20). In order to connect the cap 122 to a dili'ercnt fuse wire all hat necessf y is hit the cap sulliciently to disengage the tubular cormector from one of the terminals 120 and then rotate the cap until the connector 12 is alincz with the next terminal 120 and then press down the -ap engaging the terminal and connector.

I have in'iproved the constr 'on of such iuses by providing means for guiding the cap 122 from one fuse connection to the next whereby the change can be made quickly and elliciently by a person by hand or wherehy such a fuse maybe utilized as an externally controlled device for the fuse boxes of the present invention. The means en'iployed comprises rifiing, cam grooves or slots 12% either on the rotatable cap 122 or on a ring 125 secured to the end of the tube 117 under cap 122 as illustrated in Figs. 18 and 20 and cooperating with a pin or set screw 126 riding therein and secured to the cooperating relatively rotatable member. in the case illustratcd the rotatable cap 122. The rii'ling comprises a plurality lon, itudinal or axially extending portions 1 spaced around the cartrid e and equaling in number the fuse terminals 120. These longitudinal portions 12'? are 01" suliicientlength and so located as to allow suflicient axial movement of the cap 122 to completely engage and disengage the terminals 120. The portions 127 are connected by angular grooves or camways 128 comprising a part sloping transversely towards the end of the fuse and a communicating part having a steeper slope in the op posits direction from the corner 129 to the next longitudinal portion 127, the two communicating parts between adjacent portions 127 forming the corner 129. The arrangement is such that when the cap 122 raised or moved outwardly axially it will be determined to rotate in one direction, the pin 126 riding in the angular portion 128 to the corner 129 when the outward movement is stopped. The cap 1221s then pushed down.

and then a push on the cap serves to remove the connector 123 from one terminal and places it on the next, the necessary rotation being caused by the grooved connections between the longitudinal portions 127. hen such a fuse is to be sold commercially or separately it is provided with a spring clip 130 secured to the cap 122 and adapted to engage the several depressions 131 on the ring 121 to hold the cap 122 in place when depressed, maintaining good electrical contact.

In Figs. and 16 1 illustrate how multiple enclosed cartridge fuses MFG of the type shown in Figs. 17 and and above described may be utilized in a fuse boX. Such box 132 is of the type previously described and comprises a cover 133 which is pivoted. An insulating'base 134 having a switch 135 mounted thereon is located within the box 132. base 134 also supports the fuses, two or more. The electrical connections into and out of the box and to and. from the meter, being well known, are not illustrated.

Mounted upon the insulating base are fuse connecting terminals or sockets 136 (one being shown) in which the fuses MFG may be firmly secured at their ends 119 by any suitable means such as set screws 137. In the embodiment illustrated the fuse is at right angles to the cover. The opposite end of the fuse or rotatable cap 122 is supported by and between and electrically connected to the spring clips 138 on the upper end of a metal bracket 139 forming the opposite fixed ter minal of the fuse and mounted on base 134. The arrangement of socket 136 and clip 138 is such that the fuse may be easily removed therefrom, the clips 138 permitting the movement of the cap 122 for changing fuse wires.

The

For use in fuse bones the rotatable cap 122 is preferably provided with a lug 140 to which may be secured preferably by means of a set screw 141, an insulating rod 142. The rod 142 is of suiiicient length to extend through the box, or as here illustrated, the cover 133. The end of the rod outside of the box is provided with a swiveled ring 143 whereby the rod may be actuated. Mounted on the rod or handle 142 within the-box are spring abut ments 144 145, the inner one 144 of which being fixed to the rod and the outer one 145 being slidable on the rod. Around the rod and interposed between the abutments is a coiled spring 146. The cover 133 is provided with a slot 147 of sufficient size to allow the ring 143 to pass through it when the cover is opened. The upper abutments 145 closes this slot however when the cover is closed. "When the cover is closed with the rod 142 projecting through the slot 147, it engages the upper abutment 145 holding it stationary and thereby compressing the spring 146 which forces the rotatable cap 122 down.

When it is desired to change to a new fuse wire connection all that is necessary is to pull out on the ring 143 as far as it will go and then release it. The spring 146 then forces the cap 122 downwardly connecting a new fuse wire, the action being, in a way, automatic by reason of the construction illustrated in Figs. 17 to 20. In order to prevent lateral displacement of the rod 142 due to the rotation of the cap 122, the cover 133 is provided with depressions 148 fitting around the upper abutment 145 to hold it in place. l Vhen the fuse wires in any cartridge MFG areused up the cover 133 may be unlocked and opened, the ring 143 holding the upper abutment 145 in place on its rod. The rod 142, can now be disconnected from the fuse cartridge MFG and the exhausted cartridge remove d and a new one inserted and connected to the handle. The cover is then closed and locked and the device is ready for operation again should a fuse'blow out.

In Figs. 21. and 22 I illustrate means for actuating a plurality of multiple fuse devices such as multiple cartridge and plug fuses, by means of a single instrumentality or member whereby different combinations of the fuse wires of the several multiple fuses may be placed in the circuits. The invention is illustrated applied to the type of fuse shown in Figs. 17 to 20 and above described although it is applicable to all types of multiple fuse devices.

The box 132 illustrated is of the enclosed type like those previously described being provided with a pivoted cover 133 and having therein a porcelain base 134 with a switch (not illustrated) thereon but like that previously described.

The several enclosed multiple fuse tridges MFG are mou ed in the box in fuse connecting terminals, fuse clips or socket-s and are arranged flat upon the base. The lined terminals 119 of the fuses are rigidly secured upon base 131 in sockets 136 by means of set screws 137 whereby a pull may be permitted on the'fuse to actuate tae rotatable fuse cap 122. A pair of spring clips 138 mounted upon the base embrace opposite sides of the rotatable cap 122 of each fuse forming an electrical connection therewith while allowing its fuse changing movement, the clips 138 preferably extending beyond the caps 122 as illustrated to maintain full con tact as the cap is moved axially. 'lhe socket 136 and clips 188 111 the lixed terminals of the fuse within the box, allowing its easy removal.

Arranged transversely within the box and jcurnaled in the opposite sides of the box a U shaped actuating member 149, positioned to be connected to the several rotatable caps 122 of the fuses. Connected centrally to the member 149 is a handle 150 which extends through a slot 151 in the cover and through a hole in. a shield 152 slidably mounted in slideways 153 on the bottom of the cover for the iurpose and in the manner described in connection. with Figs. 8 and 9.

:iccurcd preferably by set screws to the lugs 155 of the movable fuse caps are the stems 156-157 one 156 of which is permauently connected to the actuating member L19 and the other 157 of which is periodically or intermittently so connected. The actuating member 1 19 is provided with slot ted lugs158 extending transversely of stems 156-157. The stem 156 extending through the slot of one lug 158 is connected permanently to the actuating member by means of heads 15?) engaging opposite sides of the lug and secured to stem 156. The other stem 157 likewise extends through the slot of the other lug and provided with a head 160 between its lug 15S and its fuse cap, the actuating member 149 being free to more in one direction without pulling stem 157 with it, but when moved in the opposite direction to engage head 160 and force the stem 157 back and hence its cap.

Secured upon the permanently connected stem 156 is a wheel 161- having a spring cam 162. The spring cam 162 is secured at one end 163 to the periphery of the wheel, diverges outwardly therefrom for about a quarter of the circumference of the wheel and then forms an inwardly directed step 16 1, the free end 165 of the cam spring entering a slot or recess 156 in the periphery of the wheel. Slidably mounted in bearing lugs 167 upon the actuating member 1&9 is a trans verse rod or pin 168 having a head 169 at one end engaging the cam wheel 161, a spring 170 being interposed between the head and one of the l; earing lugs 167 for maintaining their engagement and for normally holdmg the rod 168 in a left hand position. ihe opposite end of the rod is provided with a semicylindrical recess 171 adapted to engage the opposite stein 157. ililfiill 157 has a reduced portion 17 2 forming a circiunferential grome in which the end of the rod 168 periodically his to connect the stem 157 thereto to enable its actuation by means of rho handleloll. '11 e rod 168 is mounted 111 its bearings non- 1U ably, preferably by making the rod an gular in cross section and likewise its bear- I A. pair of springs 173 are so connected .0 t ie actuating member 14!) and to the box 132 as to normally hold the member in a position tending to hold the rotatable caps irmly upon the ends of their il'lises.

As illustrated in Figs. 17 to each fuse ca 'tridge MFG used in Figs. 21 and has four fuse wires therein although. any convenient number of wires may be used in each cartridge. lVhen four wire cartridges are used, upon each actuation of the handle 150 back and forth the left hand cap and its stem 156 rotates a (piarter of a turn making a new so element connection. The spring cam 162 is so arranged upon the wheel 161 that beginning with the return movement of the lever 1530 upon each successive fourth actuation thereof (assuming that 'or the position of the cam shown in. Fig. the lever has already been actuated twice) the spring cam rides over the head 169 and overcoming the spring 170 forces the opposite end 171 of the pin 168 against the other stem 157, the springiness of the cam spring 162 preventing buckling or sticking of the pin 168 while it is in engagement with the enlarged portion of the stem 157. When the fourth return movement is completed the cam spring 162 forces the rod 168 into engagement with and connection to the reduced portion 172 of the stem 157. Whcn the hamlle 150 is again actuated and released both stems 156 are actuated rotating both caps a quarter of a turn to new fuse wire positions, the cam spring 162 remaining in engagement with the head 16!) at least until the outward movement is completed when the cam spring 162 releases the head 169 allmving the rod spring 170 to move the rod out of engagementwith the stem. 157. Wlien the handle 150 is released springs 173 pull the actuating member back, forcing both fuse caps 122 into a new fuse wire or element relation and hold ing them there. The number of actuations necessary to form all the different combinations will vary with the number of fuse wires in each cartridge. The cam 162 will then be arranged differently for a different number of wires to control one of the fuse devices at the right time to make these difference combinations.

lVhen there are four fuse wires in each cartridge as illustrated, upon siz-ttee actuations of the member or handle 150 each successive liil) ltlS termined by the number of actuations, making diiferent'combinations of the wires of the devices. The improvement illustrated in Figs. 21 and 22 also has the advantage over the construct-ions of the other figures herein described in which, to change a fuse, it is necessary to actuate one external means and then another until two good fuse positions are secured. By utilizing a single actuating member with the interposed mechanism all that is necessary is to continue to actuate the member until two good fuse wires or elements are connected, as indicated by lighting of the. lamps or movement of the machinery utiliz-f ing the power.

If so desired the fuse changing device 149 may be locked until the switch is opened. For this purpose I have illustrated hooks 174 extending over the actuating member in such position as to prevent it from being pulled back until the hooks 174 are raised. These hooks are securedto a switch (not illustrated) although such switches are shown in other figures of the drawings.

It will be apparent to anyone skilled in the art that the handle 150 and fuses MFG must be properly insulated from each other, as by making the stems 1567 and rod 168 of good strong insulating material. An advantage of this invention is that existing types of fuse boxes may be utilized with little change in their construction. The enclosed multiple cartridge fuses such as illustrated in Figs. 21 and 22 are positioned just like single fuse cartridges areat present but in the propertypes of clip or socket- The 'fuse actuating device isadded to-the box at a convenient and available portion thereof. The

actuating memberextends through the cover and enables the changes of fuses without opening the box, the box being closed and inaccessible. The single. lever or actuating member simplifies the fuse changing procedure as no choice between several handles or experimenting is necessary. I If the lever is actuated long enough results will be obtained. When the fuse wires of either cartridge are exhausted the box can be opened without first removing any of the outside parts of the fuse changing device and the old fuse cartridge replaced by a new one which is then connected up to the actuating device. The fuses employed can be available inquantities, that is,

are standard and are fireproof, each Wire being fully protected and enclosed and insulated from the others.

7 The invention insures full protection to the power companies against unauthorized access to the box and is a convenience and protection to the consumer. The invention is simple, easy to install in existing constructions, capable of replacements by standardized fuses which be easily inserted and connected and fully protects against fire and shocks. v I i In Figs. 23 to '26 is disclosed a multiple fuse arrangement of the i1on-cartridge type and of the pluglike type, distinguishing from the latter type however in that the device is devoid of the threaded socket known as the Edison base. i The form illustrated comprises a plurality of plug like multiple fuse members which may be actuated by a single instrumentality froma point outside of the casing. i

The base 175 comprises a pair of fuse member receiving sockets 176 adapted to receive the fuse members 17 7 and enclosethem, fitting them closely. The base and sockets are formed or molded from porcelain or an in sulating composition as a unitary single piece devoid of threads, receiving two multiple fuse members177, and in this respect is unlike the usual socket members or base. Each socket 176 is provided with a central metal contact or terminal 178 located in the bottom ofthe socket and connected to the lead 179 formed or embedded in base 175. The contact 178 is preferably split to tightly engage the fuse device 177 and if so desired may be spring pressed that is, mounted to be yielding axially to form a firm contact with member 177 whenthe latter is placed in position.

Likewise mounted: in each socket 176' is a second contact or terminal 180 which is secured in the socket 176 atthe upper end'in' The multiple fuse member 177 consists of a single molded or formed piece 182 which may be composed of porcelain or other suitable insulating material. The piece 182 is frusto conical in shape, being adapted to closely fit in the socket- 176. Spaced around the periphery of the piece 182 are longitudinal ridges 183 forming grooves between them, the fusible elements 184 being located in the grooves and being electrically connected together and pressed into a recess 185 in the bottom of the piece 182 into which the contact 178 fits when the fuse member 177 is placed in its socket. The upper ends 186 of the ridges 183 are wedge shape to allow the V shaped end 180 Ill) of contact to slide overthem in either direction when the fuse member is rotated, contact 180 engaging the upper portions of the fuse elements 184 to complete the circuit through them; Each piece 182 has an actuating lug 187 formed on its upper end.

Thus when the member 177 is inserted into its socket 176 the contact 178 engages the coinmon end of the several fuse elements in the axial recess and the contact 1.80 rides over the opposite ends of the fuse elements. By rotating the member 177 in either direction the fuse elements may be placed in cir cuit successively. In order to retain the fuse member 177 in position in its socket 176 and to form a complete enclosure for the fuse ele ments an annular metal cap 188 (Fig. 21) is threaded at 189 to each socket 176, the cap 188 having an overlapping portion 190 on gaging the upper side of piece 182. If preferred instead of having a separate cap 188 for each fuse member a single cover 191 of insulating material (Fig. 23) may be utilized to enclose the two fuse members 177 and retain them in position. This cover 191 as shown in section (Fig. 23) closely fits over the base 175176 retaining members 177 in their sockets and completely inclosing them in insulating material. The cover 191 can be secured in position by a screw 192 passing through the cover into the base 175.

The main feature of this invention is the simplification of the device and the reduced cost of installation and manufacture. Each device or fuse comprises two separable parts, the base (devoid of threads) and a unitar multiple fuse member which can be easily inserted and removed into and from the socket in the base. the fuse member being suit ably retained therein. The expensive metal Edison threaded base is entirely eliminated in the construction, the device comprising a unitary base with one or two sockets and the multiple fuse member or members (likewise of unitary 'simple construction) insertable therein, the fusible elements however being completely enclosed by insulating material. The base 175 is permanent. Should a fuse blow out the member 177 is rotated to a new fuse clen'ient connection and when the fuse elements of any member are exhausted the member 177 can be easily removed and replaced. a supply of the latter being available.

As illustrated in Fig. 23 the lugs 187 project through the cover 191 whereby either fuse device may be actuated without removing the cover, that is, rotated to a new fuse element position. It is preferable however to enclose the base 175 and fuse members 177 in. a metal casing 193 having a cover 194:. The lugs 187 may be extended so that each device 177 may be actuated externally (in the manner shown in Fig. 1). I have illustrated however mechanism for actuating either or both fuse devices 177 by means of a single instrumentality located. outside of the cover whereby either fuse device may be actuated without opening the be); or casing (and without unlocking it should it be locked). The means employed and the results obtained are similar to those illustrated in 1 21 and 22 and above described. The actuating means comprises a supporting plate 195 mountaal upon the bottom of the cover 1. 1 by means of a screi and asher196 and in spaced relation to the cover. An actuating knob or lhunib piece 197 is rotatably mounted in one end of the plate 195 and projects through an open ing 198 in the cover 19 1. Secured to the knob 197 at a point below the plate 195 is a finger like member 199 having downwardly projccting spaced prongs 290 adapted to detachably engage opposite flat sides of a lug 187 whereby the lug and its fuse member 177 may be rotated. A star wheel 201 is rotatably mounted in the other end of plate on an axis 202, the wheel 201 being located below the plate 195 and having prongs detachable engaging opposite flat sides of the lug 187 of the other fuse member 177. The wheel 291 has a number of teeth 20:1 corresponding in number to the number of fuse elements on the member 187 (in the embodiment illustrated six). The operation of the device illustrated in Figs. 23 and is as fol lows: Should a fuse blow out, the knob 197 is rotated (clockwise) until a good fuse is placed in circuit. Upon each complete rotation of the knob 197 the linger .199 engages a tooth 204i rotating the other fuse device counter clockwise a sixth of a turn placing it in a new fuse relation, the finger 199 having a sufficiently long radius as to describe an are when rotated enabling it to disengage the star wheel. 291 after each actiuition of the latter. This arrangement while imparting a continuous step by step rotation to one fuse device, interinittently actuates the other a step so that the fuse elements can be con nested in circuit in different combinations one with the other. The knob 197 should be continuously rotated until the lights again go on, since upon thirty six actuations or sixth turns of knob 197 all the fuse elements of one member 177 will have been connected in circuit with each fuse element of the other member 177. vVhen it is desired to replace a fuse member 177 the cover 194: is removed which carries with it the actuating mechanism, the latter di.scn;. ;a; ing the lugs 187. The cover 191 or retainer 188 is then ren'iovcd and the fuse mcn'ibcr replaced and secured. The cover 19-1 is then replaced with the prongs 200-293 properly engaging the lugs 187. The finger 199 25) can also be rotated counter clockwise with similar rosults, as shown the first sixth of a turn in this case rotating both fuse members .171. The sockets 176 being rigidly and permanently secured to the base 175, the fuse mempro modified means 205 for retaining the fuse members 1?? in position within their sockets 176. This means can be employed instead of the cover or retainingdevice 191 illustrated in Fig. 23. v

The means 205 comprises a pair of connected or integral flanged annular members 206 adapted to lit around the tops of the sockets 176 and over the members 1'? 7 retaining them in place. The members or rings 206 have central openings through which the lugs 18'? project to allow their rotation.

The spectacles like retaining means 205 is mounted that it can be raised and then ro tated to a position at right angles to that position illustrated so that the fuse members 177 can be removed and replaced When exhausted.

The means employed for performing this function, and also for performing the additional function of retaining the members 177 in position under spring pressure, comprises rod 208 secured centrally to the member 205 and .slidable longitudinally in the base 175 between the sockets 17 6 as well as rotatably therein. The lower end of the rod 208 has a head 209 between which and a portion of the base is interposed a spring 210 coiled around the rod 208 and tending to draw the member 205 down firmly upon'the sockets 17 6 and fuse members 177. The opposite end of the rod 208 has a ring 211 whereby the retaining means may be lifted and rotated out of the way to allow the insertion of new fuse members. After such new fuse members are inserted into place the member 205 is released and let down into retaining position. The spring construction herein described is such as to maintain the members 177 under spring pressure to compcnsatefor irregularities of construction and to prevent binding of the members 177 when rotated to new fuse element positions. insuring ease of operation. The spring 210 also insures that the central fuse contact 185 will be maintained in close in Fig. 27 is illustrated one means for retaining the members 177 in place under spring pressure, have-previously described how such spring pressuremay be mamtamed by spring mounting each contact 178 (Fig. 24.). Such spring pressure can be maintained by the cooperation of any of the securing or retaining means disclosed or their equivalents s defined in the claims.

I claim 1'. A plurality of multiple fuse devices, and an actuating member for said devices including means for intermittently actuating one of said devices.

2. A. plurality of multiple fuse devices each comprising fusible elements connectible in circuit, successively, a member for actuating said devices, and mechanism interposed bet veen said member and said devices for connecting said elements in circuit in different combinations thereof upon actuation of the member.

3. A fuse box having a plurality of multiple fuse devices therein having fuse elements, and a single actuating member operable from the outside of said box for, changing said ele ments within the box and including means for intermittently operating one of said devices to place said elements in circuit in diffcrent combinations.

4. A fuse box having therein sets of fuse receiving terminals, multiple fuse devices removably secured in said terminals and movable tochange fuse elements, a single actuating member operable from the exterior of said box and comprising means for differentially operating said fuse devices for securing different combinations of the fuse elemcnts in the circuit, said actuating means being disconnectible from the fuse devices to allow their removal from the box when exhausted.

5. A plurality of multiple fuse devices, each comprising a plurality of fusible elements, and a single actuating means for shifting said devices for connecting the elements in circuit, said means being arranged and constructed to successively connect in circuit each element of one device with the elements of the other device successively upon successive actuation of said means. I

6. A plurality of multiple fuse devices, each having several fuse elements, a single actuating member for actuating one of the devices upon each actuation of the member, and means operated by said member for actuating the other device intermittently.

7. a multiple fuse device comprising a plurality of sockets having terminals, members carrying fuse elements rotatably mounted in said sockets and adapted to connect said elements successively to said terminals, a star wheel rotatable with one of said members,

, and means for actuating the other member and comprising a finger for intermittently rotating said star wheel and first member.

8. A multiple fuse device comprising a plurality of sockets having terminals, fuse elewent carrying members rotatably mounted in said. sockets to successively connect the elements to said terminals, a box enclosing: said fuses, a cover lor said. box, and actuating means for said members, mounted on the inner side of said cover, accessible at the opposite side of the cover and movable to disengage the members when the cover is opened.

9. A. multiple fuse comprising a plurality of sockets, fuse carrying ineinhers therein, a device retaining said IDUIXIlJQIS in place and including a spring for holding said members under spring presslu'e, said device being liftable againstsnid spring and rotatable to allow inserting of new members.

FRED WV. BAUM. 

